Author/Authors :
Aulchenko، نويسنده , , V.M. and Bogdanchikov، نويسنده , , A.G. and Botov، نويسنده , , A.A. and Bukin، نويسنده , , A.D and Bukin، نويسنده , , D.A and Dimova، نويسنده , , T.V and Druzhinin، نويسنده , , V.P and Filatov، نويسنده , , P.V and Golubev، نويسنده , , V.B. and Kharlamov، نويسنده , , A.G. and Korol، نويسنده , , A.A. and Koshuba، نويسنده , , S.V. and Obrazovsky، نويسنده , , A.E. and Pakhtusova، نويسنده , , E.V. and Serednyakov، نويسنده , , S.I. and Sirotkin، نويسنده , , A.A. and Usov، نويسنده , , Yu.V. and Vasiljev، نويسنده , , A.V.، نويسنده ,
Abstract :
The new tracking system of the Spherical Neutral Detector for experiments at the VEPP-2000 e + e - collider in Novosibirsk is described. The system consists of a 9-layer drift chamber with 24 jet cells and a proportional chamber in a common gas volume. Main system features are its small size and high density of readout channels for gaseous tracking systems at colliding experiments.
ift chamber provides at least four measurements along the track for charged particles within 94% solid angle and nine measurements for particles propagating at large angle relative to the beam axis. R - ϕ coordinates (in a plane perpendicular to the beam axis) are obtained using the ionization drift time measurement. Longitudial coordinates are measured using charge division on anode wires and charge distribution on cathode strips. Design angular resolutions for radial tracks are σ ϕ = 0 . 26 ∘ , σ θ = 0 . 3 ∘ , the vertex resolution is σ R = 0.2 mm .
ll-size prototype of the tracking system has been assembled and tested. The wire structure of the prototype represents one quadrant of the chamber. Results of the prototype assembly quality control and tests with radioactive sources and cosmic rays are presented. They are in a good agreement with expected system parameters.
